Disk strain-insulator.



I L. STEI'NBERGER.

DISK STRAIN-INSULATOR.

LICATION FIIJED 1,212,704; r I Emma Jan.l6 ,l9l 7.

' WITNESSES if Arron/15f UNITED STATES PATENT OFFICE.

LOUIS STEINBERGER, OF BROOKLYN, NEW YORK.

DISK STRAIN-INSULATOB.

Specification of Letters Patent. 7

Patented J an. 16, 1917.

Application filed December 31, 1912. Serial No. 739,485.

To all whom it may concern:

Be it knownv that I, LOUIS STEINBERGER, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Disk Strain-Insulators, of which the following is a specification. I

This invention relates to strain insulators and particularly to those of the disk type.

It is a well known principle in this type of insulator, asshown for instance in a patent issued to me November 27th, 1908, numbered 904,370, to form the surface of the disk with annular corrugations or flanges for serving the double purpose of shedding rain Water' ing the flanges, corrugations, etc., and have therefore resulted in an increase in cost and weight of, the structure. In all instances the disk has been provided as a positive element and the ridges, corrugations, etc., have been added to the disk substantially as separate elements.

The particular ob'ect of the present invention is to provi e an insulator of the class referred to wherein the irregularities of surfacefor providing water sheds and otherwise increasing the insulating value of the disk, without increasing the size of the disk, are obtained in what might be called a combination. of the disk and the irregularities, to the end that the disk, as a positive element, is not present independently of the corrugations or ridges, nor are the ridges,

' as separate elements, present independently of the disk. The two are combined so that in forming the ridges, a disk is produced substantially without the addition of material to the structure for providing either of the features independently of the other.

A further object is to provide a structure as above which is simple of design, which embodies a minimum ofmaterial, and which is therefore cheap to manufacture, but which is nevertheless thoroughly eflicient and embodies maximum eificiency and minimum material, both as to its insulating qualities and as to its mechanical strength, for a given sized disk;

Other objects and aims of the invention, more or less specific than those referred to above, Wlll be in part obvious and in part pomtedout in the course of the following descrlptlon ofthe elements, combinations, arrangements ofparts and applications of principles, constituting the invention; and the scope of protection contemplated will be indlcated in the appended claims.

.'In' the accompanying drawings which are to be taken as a part.0f this specification, and in whlch Ihave shown a merely preferred form of embodiment of the invention Figure 1 is a transverse sectional view through an insulator embodying the features of this invention, Fig. 2 is a plan view of the same partly broken away for the saving of space, and Fig. 3 is a modifigation.

Referring to the drawings for a more detailed description of i the structure illustrated, and referring particularly to F igs' l and2, the numeral 1 indicates the body portion of the insulator, which portion is preferably of a more or less elongated cylindrical shape for receiving the strain members illustrated as 2 and3.

The strain members illustrated each comprise a short bolt having an eye as 4' at its outer end and having its inner end formed with a head 5 embedded in the material of the body 1. The inner ends of the two strain members are spaced apart and the material of the body fills the intervening space for efl'ectually insulating the members from each other.

It will be understood that, though I have shown and described the strainmembers as comprising simple bolts having heads spaced apart and molded within the body 1 in axial alinement, said strain members may of course take any form desired for increasing the mechanical strength of the structure in resisting strains placed upon the strain members.

The disk portion of the structure is illustrated generally by the reference numeral 6, and comprises a wall or annular flange of substantially uniform thickness springing from the body 1 between the ends of the body, said flange or wall being bent concentrically of the body so as to present a serpentine aspect when viewed in cross-section.

As shown in the drawings, Fig. 1, this wall or flange isillustrated as springing from a plane at substantially the median transverse line of the body, in'an upward direction as at 7, for a short distance,- turningthence downwardly into a leg 8, thence u ward into leg 9, thence downwardly into eg 10, up-' wardly into leg 11, downwardly into leg '12. and upwardly into leg 13. Thebend of the leg 7 into theleg-B forms an'annula'r rid e 14 projecting upwardly, said legs likewise orm an annular depression 15 at the under side of the disk. The bend ofthe leg-8, into the leg 9 forms an annularridge 16 projecting downwardly and said is also form an annular groove or recess 1 on the uppersurface of the structure. ,Similar ridges and-- groovesare formed by the legs 9-10, 10- 11,11-12 and 121 3. i v

It is ap arent that the structure shown and descri ed provides ridges and depres sions, with u all the advantages thereof but without material increase in the quantity of material used, for a given sized disk. The

ridges on one side of the disk accommodate the depressions of the other side.

The thickness of the material forming the wall or flange 6 may preferably be only suflicient to lend efiiciency against puncturin and for lending the required mechanica strength. In this connection it should be noted that a disk constructed with concentric annular grooves and ridges, the ridges ofone side being'opposite the grooves of the other side, and rendering the serpentine cross-section shown, is of considerably greater mechanical strength than a disk of thesame diameter, which contains the same amount of material, would be, if made flat. Likewise if some of such material should be subtracted fromthe flat disk and molded up to form annular ridges or corrugations on the otherwise flat surface, the taking away of that material would only reduce the strength of the disk that much. The structure shown therefore is seen 'to have considerably greater mechanical strength than a flat disk of the samev amount of material, either with or without ridges on the disk.

' In order to further strengthen the structure illustrated, and to more effectually guard against puncture it may be desirable to increase the thickness of the wall or flange 6 in the vicinity of the body. The

flange may be made thickest adjacent the body and be of gradually decreasing thickness toward the edge, or may be otherwise reinforced, as desired. Here it may be noted that wherever, in this specification and claims, the term substantially of uniform thickness? or, its equivalent, .is employed, such term is intended to include such variations inthickness as may be desirable for lending required strength and resistance to puncturing to given parts as above described.

Y In Fig. 1, the leg 8, nearest the body 1, is

. from t a plurality of ridges and de relatively higher toward successively shorter so that a line drawn radially across the upper surface of the disk ing the several, ridges Wlll converge with e body 1 to the edge thereof, toucha similar line drawn along the bottom sur-' face of-the disk, at a point slightly beyond vanthe edge. Such an arrangement has a tages, such as giving amaz'cimum increase 1n surface extent nearest the body 1, and

such as givinggreater mechanical strength to the structure, etc. This arrangement however, is not essential to the principles of this invention, for obviously the parts could be arranged in any other desired manner. One suchother arrangement is illustrated in Fig. 3, whereinthe ridge 18 and depression 19 nearest the body are the less marked,

and those therebeyond are of successively increasing extent.

v In Fig. 3, is illustrated a construction herein the outermost leg as 20, of the flange, is relatively long and is well adapted to form one side of a water shedding groove as 21 encircling the flange. The other side of the groove is formed by a projecting portion 22 springing from-the outer surface of the leg 20. Water entering thisv groove will flow to the lowest point and fall off without reaching either surface of the disk.

It is apparent that, in bothof the structures illustrated, the depressions or grooves between the ridges serve to present rela-.

tively dry areasv even in. the presence of heavy rain. At least one side of the struc ture will necessarily be almost entirely dry.

As many changes could be made in this construction without departing from the scope of the following claims, it is'intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative only and not in a limiting sense.

-Having thus described my invention what I claim as new and desire to secure by Let ters Patent, is

1. An insulator comprising a body, an annular flange formed on said body, the material of said flange bein formed with bends concentrically of the Iiody to provide ressions on the opposite surfaces of said ange concentrically, of the body, the ridges on one surface being disposed opposite the depressions on the other surface, the ridges being formed the periphery of the flange than near the body, the outer annular surface of the outermost ridge being intermediate the height thereof, belng inclined op ositel to the inclination of the outer-sur ace 0 said ridge 1:0

to provide an annular V-shaped groove on the inclined outer surface of said outermost ridge.

2. In a disk type insulator the combina-v tion with a centrally disposed body portion of insulating material having attaching means thereon, of an annular flange bent substantially concentrically of the body into serpentine cross section forming a series of annular ridges and depressions at opposite sides thereof, and the material of the flange being of gradually decreasing thickness away from the body portion, and said flange being connected to the body intermediate the planes of the ends of the body, substantially as shown and described.

3. In a disk type insulator, the combination with a centrally disposed body portion of insulating material having attaching means thereon, of an annular flange bent substantially concentrically of the body into serpentine cross section forming a series of annular ridges and depressions at-opposite sides thereof, said flange being connected to the body at a plane substantially midway between the oppos'ite ends oflthe body, the first bend of the flange being toward the plane of one end of the body,-the next bend being toward the opposite end of the body, the third bend being toward the first end of the body, and soon to the periphery of the flange, and all of said bends terminating short of the planes of the ends of the body.

In testimony whereof I afiix my signature in the presence of two witnesses.

LOUIS STEINBERGER.

Witnesses:

LEO M. EISENBERG, L. Gnssrono HANDY. 

